S-90429A142 3/4"-10 x 6 1/2" ASTM F835 Alloy Steel Hex Drive Flat Head Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Exceptional tensile strength of 130,000 psi ensures reliable performance under heavy loads
• Precise Class 3A thread fit provides secure fastening with reduced risk of cross-threading
• 1/2" hex drive design delivers maximum torque transmission and installation efficiency
• Partially threaded configuration allows for optimal clamping force distribution
• 82° countersink angle enables flush mounting for clean, professional finishes
• Rockwell C37 hardness rating maintains structural integrity through repeated use cycles

Professional Applications & Engineering Value

This black-oxide alloy steel flat head screw addresses critical engineering challenges in heavy machinery, structural steelwork, and industrial equipment assembly. The 3/4"-10 UNC coarse thread configuration ensures rapid installation while maintaining vibration resistance in high-stress applications. The partially threaded design concentrates clamping force precisely where needed, preventing joint loosening under dynamic loads. With Rockwell C37 hardness and 130,000 psi tensile strength, this fastener withstands extreme mechanical stresses while the black-oxide surface treatment provides durable protection against corrosion in demanding environments including manufacturing facilities, construction sites, and outdoor installations.

Specification Summary & Compliance

Manufactured to ASME B18.3 and ASTM F835 specifications with Class 3A thread fit precision. Features 3/4"-10 UNC coarse threads with minimum 2" thread length and standard 82° flat head profile. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.